Hoisting-derrick



w. M. VENABLE. HUI/STING DERRICK.

. APPLICATION FILED OCT. 2, H8. 1,376,054. PatentedApr. 26, 1921.

FIBJ.

IIIIII m/W- 3y PATENT orrics.

WILLIAM M." v'nnABLn; or, PiTTSiBTTRGH,PENNSYLVANIA, AssIeNon "r.BLAW-KNOX i COMPANY,ACORPORATIONQENEWJERSEY.

T 0 allwhomlz't may concern).

meme other buckets, or other load receive- Be it known that I, lViLLrAMVENABiJn,

a citizen of the United States, residing at Pittsburgh, in the countyoifAllegheny and Stateof Pennsylvania, have invented certain new anduseful Improvements in Hoistfor instance, as that described in my PatentNo,1,258,8 83, and in my co-pending application, Serial 'Number 242,736,though its range ofservice maybe readily'extended toingfdeyices,especially in the latter instance if suitable hoisting blockand bail be employed. Another object oftheinvention is to *improve andsimplify the construction and increase the ,efiiciency and utility. ofapi paratus of thislcharacter, Further objects carried by the boom.

' i single hoisting drum driven by any ordinary non-reversing holstingengine or moe h A stillf-urther object are toprovide an improvedapparatus capafbleof adaptationflto a widerange o-fuse;

and to provide; a simplified and eflicient means of control for the boomand the bucket V a s the provisionoi denial pe t d y power furnished bya tor,i'wherein the bucket with itsload is first hoistedvertically andthen swung away in the direction of the lengthof the boom to theunloading point, the bucket be ngdre turned in a supportedrelation tothe origi-.

'nal positiofn at thewill-of the operaton and both bucketandboombeingoperated by a complete? single operating cable under thecontrol of. the operator;

and advantages hereinafter, described "and setforth, ,or areyincident tomy inventiocml attain by means of a construction illus-" trated inpreferred form in the accompany- "ing drawings wherein- Figure 1 isa newin side 'elevationsof my improved derrick, the figure illustratingpossible operative; positions of boom and .bucket,and, I, i "QFig. 2 isan enlarged detailed drawing illustrating a, desirable"foirm ofclutching means on the mast for holding the boom in. any desiredoperative pos tion.

I Specification of Letters l'ateilt.

for the pin, the end-i nors'r ne-nEnnIoK;

Patented Apr. 26, 1921."

j m ans fil ed Detofper 2, 1918. Serial nofzsenel.

- Referring to the drawings, the reference character A denotes a mastwhich, atfa suitable distance from its base, is formed with anopenin'g41,, Through this opening the boom "13 is designed to oscillate, backand forth inthe directionof its: length, in order that the bucket C maybe moved between its operative positions, at which points the bucket isintendedto be actuated by the same means that imparts movement to theboom.

7 The'outer endof the boom is stayed to the top'of the mast by the line5, and its body portion, desirably throughout the major slot 6 throughwhich the pivotpin 7 extends to-have itsends 7 and 7 terminally carriedby thespaced side walls afa, of the mast at the sides of theopeningl. In"the preferred elements 8, 8, are positioned on. the pin to grip the'sides of the boom upon actuation ofthe hand lever 9, by the'tighteningof which the boom maybe held and supported .part thereoflfis formed withan elongated a construction illustrated in Fig. 2, clamping in a, fixedposition with reference to the mast. 7 Hubs or bearin s 10 are providedv hav ng a screw threaded engagement with one huband the end 7 extendingthrough the other-hub to terminally receive the hand, lever 9, whichlatter upon'beingactuated tightens or releases the clamping elementsfThe means for fimparting longitudinal movement to-the boom B will now bede- Near the ends oi the sloth are i j ournaled the sheaves 12 and 13,respectivel and in the opening 4, below the pin 7 ,is a similar sheave'11. The reference character scribed D designates a drum, whichmaybedriven byany ordinary non-reversingjhoisting ena.

gine or motor ,(not shown), and to which is crating cable l h From thedrum this cable passes, over'thejsheaves l l, l2 and 113,

through the bucket 13 tofthe outer-end oi 'fastened andwoundaboutahoisting or op- ,,These,- together With: such other objects ingboom movement, the boom is provided 1 near its outer-endwitha pivotedhook mema sheave 18011" the, top of the mast and 'ber l5 adapted to hookthe bucket or such vportion of the bucket as the bucket support anddisengaged from the bucket by exert- V terminates in a handle 19, theclutch lever being similarly provided with a handle 20, if desired.Obviously, .by exertingha pull on handle 19 the hook may be retractedout of the way of, or disengaged from, the bucket. Similarly, a pull onhandleQO will tighten the clamps and fixedly position the them andpermit the travel of the boom be tween such positions as are indicated.in full and dotted, lines in Fig. 1.

- The operation of the apparatus is substantially as follows. With theboom clamped and positioned asindicated in dotted lines in Fig. 1, thehook 15 is retracted ing a pullgon the handle 19. The bucket may then belowered to obtain'its load by slackening the line, which slack is'paidoutgradually when'the engine is thrown out of engagement with thedrum. With the drum in La'drive relation, the bucket may then be hoistedby the cable ltuntil it engages the hook, whereupon the bucket againassumes the dotted position shown.

. clutch is then released, and upon a further winding of the cable onthe drum endwise movement is imparted to the boom until the bucket isadvanced toward that position where it is desired to'release the load.During this movement the'bucket is held in a supported relationindependently of the cable. l/Vhen the unloading position is reached,the clamp is tightened, and the bucket opened in the usual manner, asbya trip lever (not shown); Should it benecessary in this unloadingoperation to lower the bucket the hook may be readily disengagedtherefrom by exerting a pull on' han dle 19, and the line la slackenedto accomf modate the movement. In other words, during the travel of thebucket toward or away from the mast the clampis loosened to dis engagefrom the boom, and is tightened dur-' ing vertical bucket movementsolthat the action of the line is without influence on the boom at thattime.

The apparatus isadapted to a wide range of use, and it is easilyconstructed and set up, there being an entire lack in the apparatusofany involved or expensive parts. It

maybe readily used in loading and i i'nloacl ing cars of bulk materials,for which purpose itis the mast may be stationary or rotatable, oragain, it may just as .wellbe mounted upon a turntable so as to face ina plurality of directions as desired, without'in any way affecting orrestricting the operation of the apparatus as above set forth anddescribed:

Furthermore, it may be employed in exca atingtrenches for sewers, or in"excavating and cleaningout vertical pits or shafts for names ortu'nnels, In theformer case the The time

particularly adapted. Obviously,

backing away from it, and 'the material delivered in the desireddirection by properly instance the mast may be placed at the side or theshaft and the material delivered at boom, and opposite movement willrelease an elevation on the opposite side. J

' the spirit and scope of my invention as pointedyout-in the appendedclaims; 7 r What I claim is: i i

1. A derrick comprising in combination, a mast provided with an.opening, a boom mounted in the opening "for longitudinal 'movement withrespectto the mast, braking means on the mast and disposed in saidopening adapted to releasably hold the boom atfany. position againstlongitudinal movemerit in either direction, and cable operat:

ing means forthe boom '2. A- derrick comprising in combination, a mast,a boom mounted thereon for long tudinal movement with respec't thereto,brak- I ing means on the mast adaptedto releasably engage and hold theb-oomf at any position agamst movement in either direction, a load 7receiving device associatedwith the boom,

sheaves on the mast, boom, and load receiving device, and a singleoperating cable for the boom and the load' receiving device reeved onthe sheaves and having one end fastenedat substantiallythe' outer end ofthe m-, of 1 s, 2 8. A derrick comprisingin combination, a mast, a boommounted thereonior ;longi tudinal movement with respect thereto,

" brakingmeans on the mast "adapted to releasably' engage and hold the boom at any position against movement in either-direc- 4. A (:lerr ckcomprising n combinatlon, a mast, a boom mounted thereon forlongitudinal movement, with respect thereto,

"holding means adapted to releasably hold the boom at any positionagainst movement in either directiorna grab bucket associated with theboom, and a" single cable adapted to 7 operate the bucket and to movethe boom and cable 'operating means for the,

its

facing the mast thatway'; and in the latter boom at any position againstmovement in either direction independently of the op-c crating cable.

6. In a derrick, the combination of asupport provided with a releasableclutch, a

boom pivot pin associated therewith a slotted boom normally carried nearone end by said clutch and capable of oscillatory 'movement on saidpinrelatively to the support to vary the length of the boom when releasedfrom said clutch, sheaves on said i boom and said support, a stayconnection between the other end of the boom and the support, and anoperating cable for the boom rleeved about said sheaves.

7 In an apparatus of the character described, the combination with agrab bucket having an operating cable, of a movable boom provided withsheaves near its inner and outer ends and formed intermediately with aslot, a support or mast having a sheave and provided with means forsupporting said boom in variable shortened o1 lengthened operativepositions, part of said means operatingin said slot during movement ofthe boom between its operative-pd.

sitions, said cable cooperating with lsaid sheaves and capable ofimparting movement to said boom, and means independent of said cable forsupporting the bucket during boom movement.

8. In an apparatus of the character described, the combination of amast, and a boom arranged to swing back and forth relatively to andthrough said mast, said mast provided with means adapted to releas-WILLIAM M. VENABLE.

